Two circular waves with a distance of 4 cm have a wavelength of 0.5 cm.
You will need a double slit, laser light and a screen.
A red laser with a wavelength of 630 nm and a green laser with 530 nm is used. The slit width ist 500 nm, the two slits are separated 0.02 mm and the distance between slit and screen is 70 cm.
A wave with the wavelength of 500 nm is hitting the surface at an angle of 45 °. As medium we use air and glas with a refractive index of 1.45.
The soapbubbles do have fabulous colors.
|diffraction||the spreading of waves into the area of the geometrical shadow|
|interference||superimposed waves which are amplified or wiped out|
|crest||the highest point of a wave (deutsch: Wellenberg)|
|trough||the deepest point of a wave (deutsch: Wellental)|
|constructive and destructive interference||Constructive interference occurs if two wavefronts do not have any optical path difference. Destructive interference occurs if the optical path difference is half the wavelength.|
|single slit interference||The diffraction at a single slit causes interference.|
|double slit interference||Interference due to different wavefronts form two slits.|
|interference on thin layers||on thin layers the optical path difference is so small that interference occurs.|